package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
自定义切面类,实现字段自动填充功能逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("execution(* com.sky.mapper.*.*(..) )&& @annotation(com.sky.anno.AutoFill)")
    public void pt(){

    }


//    前置通知
    @Before("pt()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        //1,先拿到当前切入点的注解属性值
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        AutoFill autoFill = method.getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到方法的参数 -->  赋值
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //2,判断是新增还是修改
        //3,根据不同的数据库操作类型增强不同的字段
        //新增
        Class clazz = entity.getClass();
        if(operationType == OperationType.INSERT){
            //创建人  创建时间  修改人  修改时间

            Method setCreateTime = clazz.getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setUpdateTime = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setCreateUser = clazz.getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateUser = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象的属性赋值
            setCreateTime.invoke(entity,now);
            setUpdateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateUser.invoke(entity,currentId);


        }else if(operationType == OperationType.UPDATE){
            //修改人  修改时间
            Method setUpdateTime = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = clazz.getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }

    }
}
